A three-phase integrated elliptical voltage transformer for 220kV high-voltage switch

Abstract

The present application discloses a three-phase integrated elliptical voltage transformer for 220kV high-voltage switch, belonging to the technical field of voltage transformer, which includes a housing, a plurality of prestressed components and three voltage transformer bodies located in the housing, a shielding member located between two adjacent voltage transformer bodies is provided in the housing, the housing includes a cover plate, an elliptical middle shell and a base; each prestressed component is arranged at intervals along the circumferential direction of the middle shell, the prestressed component includes a force transmission structure, a steel strand, a first anchoring structure and a second anchoring structure, the force transmission structure is fixed on the concave arc surface of the middle shell, the first anchoring structure is used to fix one end of the steel strand on the cover plate, the second anchoring structure is used to fix the other end of the steel strand on the base, the steel strand is in a taut state, the steel strand abuts on the force transmission structure, and the tensioning force of the steel strand is applied to the concave arc surface of the middle shell through the force transmission structure. The present application has both the reduction of the housing volume and the improvement of the housing pressure resistance.

Description

Technical Field

[0001] The present application belongs to the technical field of voltage transformers and relates to a three-phase integrated elliptical voltage transformer for a 220kV high-voltage switch. Background Art

[0002] At present, the voltage transformer for 220kV high-voltage switchgear includes three circular shells and voltage transformer bodies respectively located in the three circular shells. The three voltage transformers are three-phase and arranged in a line. Taking the traditional design of a single shell with a diameter of 500mm as an example, the total width of the three shells arranged in a line after installation is not less than 1500mm, that is, the total width after installation is relatively large.

[0003] The miniaturized design of high-voltage switches is currently the trend of the entire high-voltage switch industry. In order to meet the demand for miniaturization of high-voltage switches, a Chinese patent with application number 2021215561127 discloses a three-phase integrated elliptical voltage transformer for a 220kV high-voltage switch, including an integrated housing, a voltage transformer and a shielding member. The integrated housing contains three groups of voltage transformers, that is, the three groups of voltage transformers are integrated into the same housing, and the three groups of voltage transformers are closely arranged. Shielding members are installed on the iron cores of two adjacent voltage transformers. The integrated housing and the iron cores of the voltage transformer are grounded, and the primary high-voltage coil on the upper part of the voltage transformer is connected to high voltage. The cross-section of the integrated housing is elliptical, which reduces the space occupied by the circular integrated housing, and the integrated housing is not longer than 1400mm.

[0004] However, the pressure resistance of the elliptical shell is weaker than that of the traditional three-circular shell. If, in order to improve the pressure resistance of the elliptical shell, multiple partitions are set in the elliptical shell, the two sides of the partitions are respectively fixed to the opposite side walls in the elliptical shell. Although the partitions can effectively improve the pressure resistance of the shell, the partitions will occupy the internal space of the shell, thereby increasing the volume of the shell in disguise. Summary of the invention

[0005] In order to reduce the volume of a shell and improve the pressure resistance of the shell, a three-phase integrated elliptical voltage transformer for a 220kV high-voltage switch is provided.

[0006] The present application provides a three-phase integrated elliptical voltage transformer for a 220kV high-voltage switch, which is specifically implemented by the following technical solutions:

[0007] A three-phase integrated elliptical voltage transformer for a 220kV high-voltage switch, comprising a shell, a plurality of prestressed components and three voltage transformer bodies located in the shell, wherein a shielding member located between two adjacent voltage transformer bodies is provided in the shell, wherein the shell comprises a cover plate, an elliptical middle shell and a base; wherein each prestressed component is arranged at intervals along the circumferential direction of the middle shell, wherein the prestressed component comprises a force transmission structure, a steel strand, a first anchoring structure and a second anchoring structure, wherein the force transmission structure is fixed to the inner concave arc surface of the middle shell, wherein the first anchoring structure is used to fix one end of the steel strand to the cover plate, and wherein the second anchoring structure is used to fix the other end of the steel strand to the cover plate. The steel strand is fixed on the base, and is in a taut state. The steel strand is in contact with the force transmission structure, and the tensioning force of the steel strand is applied to the concave arc surface of the middle shell through the force transmission structure; the force transmission structure includes a plurality of first force transmission plates, and the first force transmission plates are fixed to the concave arc surface of the middle shell, and the first force transmission plates extend along the long axis direction of the middle shell, and the first force transmission plates are arranged at intervals along the height direction of the middle shell, and the width of each first force transmission plate gradually decreases toward both sides along the middle part of the height direction of the middle shell, and a bayonet is provided on one side of the first force transmission plate, and the steel strand is sequentially clamped in the bayonet of each first force transmission plate; reinforcing ribs are fixed between the surface of the first force transmission plate and the concave arc surface of the middle shell.

[0008] Through the above technical solution, by setting up a prestressed component, the tensioning force of the steel strand is applied to the concave arc surface of the middle shell through the force transmission structure, thereby applying compressive stress from the inside to the outside to the middle shell. When the middle shell is subjected to external pressure, the compressive stress can effectively resist the external pressure, thereby reducing the compressive deformation of the middle shell; and the force transmission structure and the steel strand occupy less space, and have less impact on the internal voltage transformer body, thereby ensuring the compact volume of the middle shell.

[0009] By setting the position and width of the first force transmission plate, the steel strand is made arc-shaped, and the tensioning force of the steel strand is applied vertically to the concave arc surface of the middle shell through each first force transmission plate, thereby improving the compressive resistance of the middle shell and applying a stronger compressive stress to the middle part of the height direction of the middle shell.

[0010] Optionally, the width of each of the first force transmission plates gradually decreases toward both sides along the middle portion in the direction of the long axis of the middle shell.

[0011] Through the above technical solution, by setting the width of the first force transmission plate, the larger the width of the first force transmission plate, the greater the deformation degree of the steel strand, and the greater the preload applied by the steel strand to the middle shell, thereby improving the compressive resistance of the middle part of the middle shell in the long axis direction.

[0012] Optionally, an elliptical matching groove is provided at the edge of the lower surface of the cover plate and the edge of the upper surface of the base, a rubber pad is provided at the bottom of the matching groove, and a groove wall of the matching groove fits the outer convex arc surface of the middle shell.

[0013] Through the above technical solution, by setting the matching groove, the cover plate and the base have a horizontal limiting effect on the middle shell, and cooperate with the prestress and reaction force of the steel strands. The reaction force of the steel strands is used to force the cover plate and the base to press against the middle shell, thereby realizing a fixed connection between the cover plate, the middle shell and the base. In addition, the setting of the rubber pad can improve the sealing of the matching position.

[0014] The present application provides a three-phase integrated elliptical voltage transformer for a 220kV high-voltage switch, which is specifically implemented by the following technical solutions:

[0015] A three-phase integrated elliptical voltage transformer for a 220kV high-voltage switch comprises a shell, a plurality of prestressed components and three voltage transformer bodies located in the shell, wherein a shielding member located between two adjacent voltage transformer bodies is provided in the shell, the shell comprises a cover plate, an elliptical middle shell and a base; the prestressed components are arranged at intervals along the circumferential direction of the middle shell, the prestressed components comprise a force transmission structure, a steel strand, a first anchoring structure and a second anchoring structure, the force transmission structure is fixed on the inner concave arc surface of the middle shell, the first anchoring structure is used to fix one end of the steel strand on the cover plate, the The second anchoring structure is used to fix the other end of the steel strand on the base, the steel strand is in a taut state, the steel strand abuts against the force transmission structure, and the tensioning force of the steel strand is applied to the concave arc surface of the middle shell through the force transmission structure; the force transmission structure includes a plurality of second force transmission plates, the second force transmission plates are fixed to the concave arc surface of the middle shell, the second force transmission plates extend along the long axis direction of the middle shell, the second force transmission plates are arranged at intervals along the height direction of the middle shell, and the second force transmission plates are staggered along the height direction of the middle shell, the steel strand passes around one end of each second force transmission plate in the length direction in turn, and the steel strand is in a wavy shape.

[0016] Through the above technical solution, by setting the position of the second force transmission plate, the steel strand is made to be wavy, and the tensioning force of the steel strand is passed through each second force transmission plate to force two adjacent second force transmission plates to separate, and the force of the second force transmission plates separating is applied to the concave arc surface of the middle shell, thereby improving the compressive resistance of the middle shell.

[0017] Furthermore, the second force transmission piece and the steel strand are both located at the inner concave arc surface of the middle shell, which has little influence on the internal voltage transformer body, thereby ensuring the compactness of the volume of the middle shell.

[0018] The present application provides a three-phase integrated elliptical voltage transformer for a 220kV high-voltage switch, which is specifically implemented by the following technical solutions:

[0019] A three-phase integrated elliptical voltage transformer for a 220kV high-voltage switch, comprising a shell, a plurality of prestressed components and three voltage transformer bodies located in the shell, wherein a shielding member located between two adjacent voltage transformer bodies is provided in the shell, the shell comprising a cover plate, an elliptical middle shell and a base; the prestressed components are arranged at intervals along the circumferential direction of the middle shell, the prestressed components comprising a force transmission structure, a steel strand, a first anchoring structure and a second anchoring structure, the force transmission structure being fixed on the inner concave arc surface of the middle shell, the first anchoring structure being used to fix one end of the steel strand on the cover plate, the second anchoring structure being used to fix the other end of the steel strand on the base, the steel strand being in a taut state, the steel strand abutting against the force transmission structure, and the tensioning force of the steel strand being transmitted through the force transmission structure applied to the concave arc surface of the middle shell; the force transmission structure includes an arched rib and a plurality of third force transmission plates, the arched rib and the third force transmission plates are both fixed to the concave arc surface of the middle shell, the third force transmission plates extend along the long axis direction of the middle shell, the third force transmission plates are arranged at intervals along the height direction of the middle shell, and the third force transmission plates are staggered along the height direction of the middle shell, and one end of the third force transmission plates in the length direction has a guide surface; the arched rib extends along the height direction of the middle shell, the width of the arched rib gradually decreases from the middle to the two ends, and the arched rib passes through the third force transmission plates; the steel strand successively passes around one end of the length direction of each third force transmission plate, the steel strand abuts against the guide surface of the third force transmission plate, and the tensioning force of the steel strand is converted into a force forcing the steel strand to abut against the arc-shaped side of the arched rib through the guide surface, and the steel strand is wavy.

[0020] Through the above technical solution, by arranging the arched ribs and the third force transmission plate, the steel strands are in contact with the guide surface of the third force transmission plate, and the tensioning force of the steel strands is converted through the guide surface into a force forcing the steel strands to abut against the arc-shaped side of the arched ribs, that is, a part of the tensioning force of the steel strands is applied vertically to the concave arc surface of the middle shell through the arched ribs, and another part of the tensioning force of the steel strands is passed through the third force transmission plate to force two adjacent third force transmission plates to separate, and the force of the third force transmission plates separating is applied to the concave arc surface of the middle shell, thereby comprehensively improving the compressive resistance of the middle shell.

[0021] Furthermore, by providing a guide surface, the steel strand is guided by the guide surface and is more closely in contact with the arched rib, thereby improving the utilization rate of the tensioning force of the steel strand. The guide surfaces of two adjacent third force transmission plates double-limit the steel strand to improve the position accuracy and stability of the steel strand.

[0022] Optionally, the prestressed component further comprises a rubber strip, the steel strand is spirally wound around the rubber strip, the guide surface is protrudingly configured with a plurality of saw teeth, and the saw teeth are engaged with the surface of the steel strand.

[0023] Through the above technical solution, by setting the cooperation between the steel strand and the rubber strip, when the middle shell is subjected to external impact force, part of the impact force will pass through the arched ribs and the third force transmission plate to force the steel strand to be tensioned, and the steel strand will move relative to the rubber strip when tensioned, and the steel strand will further wrap around the rubber strip. The rough surface of the steel strand will generate heat by friction with the rubber strip to consume the impact kinetic energy, thereby playing a role in buffering and shock absorption.

[0024] Moreover, in the process of tensioning the steel strand, the steel strand moves relative to the guide surface under the guidance of the guide surface. Since the saw teeth bite into the surface of the steel strand, the structure of the steel strand engaged by the saw teeth will be offset around the axial direction of the rubber strip, so that the steel strand is further wrapped around the rubber strip, the tensioning deformation of the steel strand is greater, the prestress applied is greater, the compressive resistance of the middle shell is further improved, and the twisting degree of the rubber strip is also increased.

[0025] Optionally, the middle shell includes two C-shaped plates and two arc-shaped side plates which are separately arranged, the two C-shaped plates are symmetrically arranged with the short axis of the middle shell as the center, and the two arc-shaped side plates are symmetrically arranged with the long axis of the middle shell as the center, the concave arc surface of the C-shaped plate is provided with a plurality of engaging grooves, the engaging grooves penetrate the C-shaped plate along the height direction of the middle shell, and the engaging grooves are arranged at intervals along the long axis direction of the middle shell; sealing strips are provided on both sides of the arc-shaped side plates; the force transmission structure is fixed on the concave arc surface of the arc-shaped side plates, and the tensioning force of the steel strand is applied to the arc-shaped side plates through the force transmission structure to force the sealing strip of the arc-shaped side plates to abut against one of the engaging grooves.

[0026] Through the above technical solution, the middle shell is arranged in combination, and the sides of the arc-shaped side plates are respectively matched with the engaging grooves at different positions to adjust and limit the distance between the two C-shaped plates, and at the same time, the distance between the two arc-shaped side plates is adjusted and limited, that is, the major axis length and the minor axis length of the middle shell can be adjusted, thereby adjusting the volume of the middle shell to be suitable for voltage transformer bodies of different sizes.

[0027] Moreover, through the coordination of the steel strands and the force transmission structure, the prestress of the steel strands can not only improve the compressive resistance of the middle shell, but the prestress can also force the arc-shaped side panels and the C-shaped panels to further coordinate, and force the cover plate and the base to further clamp the arc-shaped side panels and the C-shaped panels, thereby greatly improving the installation and fixing effect of the combined middle shell.

[0028] Optionally, the first force transmission plates of each of the prestressed components are staggered along the long axis direction of the middle shell.

[0029] Optionally, the first anchoring structure includes a first anchor seat and a first clip, the cover plate is provided with a first countersunk hole, the first anchor seat is located in the first countersunk hole, the first anchor seat is penetrated by a first conical hole, the first clip is located in the first conical hole, three first clips are provided and are evenly spaced around the circumference, the steel strand passes through the central area surrounded by each first clip, the outer surface of each first clip is attached to the inner wall of the first conical hole, the inner surface of the first clip is provided with a first friction protrusion, and the first friction protrusion bites the surface of the steel strand; the second anchoring structure It includes a second anchor seat and a second clip, the base is provided with a second countersunk hole, the second anchor seat is located in the second countersunk hole, the second anchor seat is penetrated by a second conical hole, the second clip is located in the second conical hole, three second clips are provided and are evenly spaced around the circumference, the steel strand passes through the central area enclosed by each second clip, the outer surface of each second clip is attached to the inner wall of the second conical hole, the inner surface of the second clip is provided with a second friction protrusion, and the second friction protrusion bites the surface of the steel strand; the first countersunk hole and the second countersunk hole are both filled with sealant.

[0030] Through the above technical solution, when installing the shell, first put the first anchor seat and the second anchor seat into the first countersunk hole and the second countersunk hole respectively, then combine the cover plate, the middle shell and the base, make the steel strand abut against the force transmission structure, and ensure that the two ends of the steel strand pass through the first tapered hole and the second tapered hole respectively. At this time, the first clamp and the second clamp respectively surround the two ends of the steel strand, and then use the hydraulic jack to tension the ends of the steel strand. The steel strand is elastically stretched to more closely abut against the force transmission structure, and during the elastic retraction of the steel strand, the steel strand The stranded wire will drive the first clip and the second clip to wedge more tightly into the first tapered hole and the second tapered hole. Under the guidance of the inner walls of the first tapered hole and the second tapered hole, the three first clips approach each other to tightly bite one end of the steel strand, and the three second clips approach each other to tightly bite the other end of the steel strand, thereby preventing further elastic retraction of the steel strand, that is, completing the fixation of the steel strand and keeping the steel strand taut. Then, the excess part of the steel strand is cut off, and the sealant is filled into the first countersunk hole and the second countersunk hole to complete the encapsulation.

[0031] The beneficial effects of this application are:

[0032] 1. By setting up the prestressed component, the tensioning force of the steel strand is applied to the concave arc surface of the middle shell through the force transmission structure, thereby applying compressive stress from the inside to the outside to the middle shell. When the middle shell is subjected to external pressure, the compressive stress can effectively resist the external pressure, thereby reducing the compressive deformation of the middle shell; and the force transmission structure and the steel strand occupy less space, and have less impact on the internal voltage transformer body, thereby ensuring the compact volume of the middle shell;

[0033] 2. By setting the position and width of the first force transmission piece, the steel strand is in an arc shape, and the tensioning force of the steel strand is applied vertically to the concave arc surface of the middle shell through each first force transmission piece, thereby improving the compressive resistance of the middle shell, and applying a stronger compressive stress to the middle part of the height direction of the middle shell; and the first force transmission piece and the steel strand are both located at the concave arc surface of the middle shell, which has little effect on the internal voltage transformer body, thereby ensuring the compact volume of the middle shell;

[0034] 3. By arranging the cooperation between the steel strand and the rubber strip, when the middle shell is subjected to external impact force, part of the impact force will pass through the arched ribs and the third force transmission plate to force the steel strand to be stretched, and when the steel strand is stretched, it will move relative to the rubber strip, and the steel strand will further wrap around the rubber strip. The rough surface of the steel strand will generate heat by friction with the rubber strip to consume the impact kinetic energy, so as to play a role of buffering and shock absorption;

[0035] 4. The middle shell is arranged in combination, and the sides of the arc-shaped side plates are respectively matched with the engaging grooves at different positions to adjust and limit the distance between the two C-shaped plates, and at the same time, the distance between the two arc-shaped side plates is adjusted and limited, that is, the major axis length and the minor axis length of the middle shell can be adjusted, so as to adjust the volume of the middle shell to be suitable for voltage transformer bodies of different sizes; and, through the cooperation of the steel strands and the force transmission structure, the prestress of the steel strands can not only improve the compressive capacity of the middle shell, but also force the arc-shaped side plates and the C-shaped plates to further cooperate, and force the cover plate and the base to further clamp the arc-shaped side plates and the C-shaped plates, thereby greatly improving the installation and fixing effect of the combined middle shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a cross-sectional view of the overall structure of Example 1.

[0037] Figure 2 It is a cross-sectional view of the shell of Example 1 along the short axis direction.

[0038] Figure 3 Schematic diagram of the middle shell of Example 1.

[0039] Figure 4 yes Figure 3 A partial enlarged view of point A in the middle.

[0040] Figure 5 yes Figure 2 A partial enlarged view of point B in the middle.

[0041] Figure 6 Schematic diagram of the first clip of Example 1.

[0042] Figure 7 yes Figure 2 A partial enlarged view of point C in the middle.

[0043] Figure 8 Schematic diagram of the middle shell of Example 2.

[0044] Fig. 9 It is a schematic diagram of Example 2 for reflecting the matching relationship between the steel strand and the second force transmission plate.

[0045] Fig.10 Schematic diagram of the middle shell of Example 3.

[0046] Fig.11 It is a schematic diagram of Example 3 for reflecting the matching relationship between the steel strand and the third force transmission plate and the arched rib plate respectively.

[0047] Fig.12 It is a schematic diagram of the steel strand of Example 4.

[0048] Fig.13 It is a schematic diagram of Example 4 for illustrating the matching relationship between the steel strand and the saw teeth.

[0049] Fig.14 It is a top view of the middle shell of Example 5.

[0050] Fig.15 yes Fig.14 A partial enlarged view of point D in the middle.

[0051] Explanation of the accompanying drawings: 1. middle shell; 2. steel strand; 3. first anchoring structure; 4. second anchoring structure; 10. voltage transformer body; 101. shielding member; 102. cover plate; 103. base; 104. matching groove; 105. rubber pad; 11. arcuate side plate; 111. sealing strip; 12. C-shaped plate; 121. fitting groove; 21. rubber strip; 30. first countersunk hole; 31. first anchor seat; 311. first conical hole; 32. first clip; 321. first friction protrusion; 40. second countersunk hole; 41. second anchor seat; 411. second conical hole; 42. second clip; 51. first force transmission plate; 511. reinforcing rib; 512. bayonet; 52. second force transmission plate; 53. third force transmission plate; 531. guide surface; 532. serration; 54. arched rib. DETAILED DESCRIPTION

[0052] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the attached Figure 1-Figure 15 Shown in.

[0053] In the description of this specification, the description with reference to the terms "certain embodiments", "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0054] Example 1

[0055] Example 1 discloses a three-phase integrated elliptical voltage transformer for a 220kV high-voltage switch, such as Figure 1 , Figure 2 , Figure 3 As shown, the three-phase integrated elliptical voltage transformer for 220kV high-voltage switch includes a shell, multiple prestressed components and three voltage transformer bodies 10 located in the shell. A shielding member 101 located between two adjacent voltage transformer bodies 10 is provided in the shell. The shielding member 101 can be made of aluminum alloy.

[0056] The shell includes a cover plate 102, an elliptical middle shell 1 and a base 103. The middle shell 1 has an upper port and a lower port. The cover plate 102 blocks the upper port of the middle shell 1, and the base 103 blocks the lower port of the middle shell 1. In other embodiments, the middle shell 1 can be fixedly connected to the cover plate 102 and the base 103 by bolts. In this embodiment, a matching groove 104 is provided at the edge of the lower surface of the cover plate 102 and the edge of the upper surface of the base 103. The matching groove 104 is an elliptical annular groove body, and a rubber pad 105 is provided at the bottom of the matching groove 104. The upper end and the lower end of the middle shell 1 are respectively inserted into the matching grooves 104 of the cover plate 102 and the base 103. The rubber pad 105 plays a role in improving the sealing of the matching position, and the groove wall of the matching groove 104 is attached to the outer convex arc surface of the middle shell 1, that is, the cover plate 102 and the base 103 limit the middle shell 1 in the horizontal direction.

[0057] The prestressed component can not only apply prestress to the concave arc surface of the middle shell 1 to improve the compressive resistance of the middle shell 1, but also apply a clamping force along the height direction of the middle shell 1 to the middle shell 1 through the cover plate 102 and the base 103 to achieve a fixed connection between the cover plate 102, the middle shell 1 and the base 103.

[0058] Specifically, Figure 2 , Figure 3 , Figure 4As shown, each prestressed component is arranged at intervals along the circumferential direction of the middle shell 1, and the prestressed component includes a force transmission structure, a steel strand 2, a first anchoring structure 3 and a second anchoring structure 4. The force transmission structure is fixed on the concave arc surface of the middle shell 1. In this embodiment, the force transmission structure includes a plurality of first force transmission pieces 51, and the first force transmission pieces 51 are fixed on the concave arc surface of the middle shell 1. The first force transmission pieces 51 extend along the long axis direction of the middle shell 1, and each first force transmission piece 51 is arranged at intervals along the height direction of the middle shell 1, and the width of each first force transmission piece 51 gradually decreases toward both sides along the middle part of the height direction of the middle shell 1, and a bayonet 512 is provided on one side of the first force transmission piece 51, and a reinforcing rib 511 is fixed between the surface of the first force transmission piece 51 and the concave arc surface of the middle shell 1.

[0059] In other embodiments, the surface of the steel strand 2 may be coated with a rubber coating.

[0060] Moreover, at the same height position of the middle shell 1, the width of each first force transmission piece 51 gradually decreases toward both sides along the middle part of the long axis direction of the middle shell 1, that is, the width of the first force transmission piece 51 located in the middle part of the long axis direction of the middle shell 1 is the largest. In other embodiments, the first force transmission pieces 51 of each prestressed assembly are staggered along the long axis direction of the middle shell 1, that is, the first force transmission pieces 51 on the two opposite inner walls of the middle shell 1 are staggered.

[0061] like Figure 2 , Figure 5 , Figure 6 , Figure 7 As shown, the first anchoring structure 3 is used to fix one end of the steel strand 2 on the cover plate 102, and the second anchoring structure 4 is used to fix the other end of the steel strand 2 on the base 103. Specifically, the first anchoring structure 3 includes a first anchor seat 31 and a first clip 32. The cover plate 102 is provided with a first countersunk hole 30, and the first countersunk hole 30 is communicated with the inner cavity of the shell. The first anchor seat 31 is located in the first countersunk hole 30. A first conical hole 311 is penetrated through the middle position of the first anchor seat 31. The first clip 32 is located in the first conical hole 311. The first clip 32 is provided with three first clips 32 and is evenly spaced around the circumference. The steel strand 2 passes through the central area surrounded by each first clip 32. The outer surface of each first clip 32 is attached to the inner wall of the first conical hole 311. The inner surface of the first clip 32 is provided with a first friction protrusion 321, and the first friction protrusion 321 bites the surface of the steel strand 2.

[0062] The second anchoring structure 4 includes a second anchor seat 41 and a second clip 42. The base 103 is provided with a second countersunk hole 40, and the second countersunk hole 40 is communicated with the inner cavity of the shell. The second anchor seat 41 is located in the second countersunk hole 40. The second anchor seat 41 is penetrated by a second conical hole 411. The second clip 42 is located in the second conical hole 411. There are three second clips 42 and they are evenly spaced around the circumference. The steel strand 2 passes through the central area enclosed by each second clip 42. The outer surface of each second clip 42 is attached to the inner wall of the second conical hole 411. The inner surface of the second clip 42 is provided with a second friction protrusion (not shown in the figure), and the second friction protrusion bites into the surface of the steel strand 2.

[0063] When installing the shell, first put the first anchor seat 31 and the second anchor seat 41 into the first countersunk hole 30 and the second countersunk hole 40 respectively, then combine the cover plate 102, the middle shell 1 and the base 103 (the upper end and the lower end of the middle shell 1 are respectively inserted into the matching grooves 104 of the cover plate 102 and the base 103), and the steel strand 2 is sequentially clamped in the bayonet 512 of each first force transmission piece 51, and due to the different positions and width changes of the first force transmission piece 51, the steel strand 2 is arc-shaped, and then ensure that the two ends of the steel strand 2 pass through the first tapered hole 311 and the second tapered hole 411 respectively. At this time, the first clamp 32 and the second clamp 42 respectively surround the two ends of the steel strand 2, and then use the hydraulic jack to tension the ends of the steel strand 2, and the steel strand 2 elastically The steel strand 2 is stretched to more tightly abut against the first force transmission plate 51, and during the elastic retraction process of the steel strand 2, the steel strand 2 will drive the first clamp 32 and the second clamp 42 to wedge more tightly into the first tapered hole 311 and the second tapered hole 411. Under the guidance of the inner walls of the first tapered hole 311 and the second tapered hole 411, the three first clamps 32 approach each other to tightly bite one end of the steel strand 2, and the three second clamps 42 approach each other to tightly bite the other end of the steel strand 2, thereby preventing the steel strand 2 from further elastically retracting, that is, completing the fixation of the steel strand 2, keeping the steel strand 2 in a taut state, and then cutting off the excess part of the steel strand 2, and filling the sealant into the first countersunk hole 30 and the second countersunk hole 40 to complete the encapsulation.

[0064] In this way, the tensioning force of the steel strands 2 is applied vertically to the concave arc surface of the middle shell 1 through each first force transmission plate 51, that is, prestress is applied to the middle shell 1 from the inside to the outside. When the middle shell 1 is subjected to external pressure, the prestress can effectively resist the external pressure, thereby reducing the compressive deformation of the middle shell 1.

[0065] Furthermore, the force transmission structure and the steel strands 2 occupy a relatively small space, and thus have little impact on the internal voltage transformer body 10 , thereby ensuring that the volume of the middle shell 1 is compact.

[0066] Secondly, the tensioning force of the steel strands 2 also forces the cover plate 102 and the base 103 to press against the middle shell 1, that is, the tensioning force of the steel strands 2 applies a clamping force along the height direction of the middle shell 1 to the middle shell 1 through the cover plate 102 and the base 103, thereby achieving a fixed connection among the cover plate 102, the middle shell 1 and the base 103.

[0067] Example 2

[0068] The difference between Example 2 and Example 1 is that Figure 8 , Fig. 9 As shown, the force transmission structure includes a plurality of second force transmission pieces 52, the second force transmission pieces 52 are fixed to the inner concave arc surface of the middle shell 1, the second force transmission pieces 52 extend along the long axis direction of the middle shell 1, the second force transmission pieces 52 are arranged at intervals along the height direction of the middle shell 1, and the second force transmission pieces 52 are staggered along the height direction of the middle shell 1, the second force transmission pieces 52 are right-angled triangles, and the acute angles of two adjacent second force transmission pieces 52 are separated.

[0069] The steel strand 2 passes around one end of each second force transmission piece 52 in the length direction (the end of the second force transmission piece 52 away from the acute angle) in sequence. At this time, the steel strand 2 is in a wavy shape. Therefore, the tensioning force of the steel strand 2 passes through each second force transmission piece 52 to force two adjacent second force transmission pieces 52 to separate. The force of the second force transmission pieces 52 separating is applied to the concave arc surface of the middle shell 1, thereby improving the compressive resistance of the middle shell 1.

[0070] Example 3

[0071] The difference between Example 3 and Example 1 is that Fig.10 , Fig.11 As shown, the force transmission structure includes an arched rib 54 and a plurality of third force transmission pieces 53. The arched rib 54 and the third force transmission pieces 53 are both fixed to the inner concave arc surface of the middle shell 1. The third force transmission pieces 53 extend along the long axis direction of the middle shell 1. The third force transmission pieces 53 are arranged at intervals along the height direction of the middle shell 1, and the third force transmission pieces 53 are staggered along the height direction of the middle shell 1. One end of the third force transmission piece 53 in the length direction has a guide surface 531, so that the third force transmission piece 53 is an obtuse triangle.

[0072] The arched ribs 54 extend along the height direction of the middle shell 1 , and the width of the arched ribs 54 gradually decreases from the middle to both ends. The arched ribs 54 pass through each third force transmission sheet 53 .

[0073] The steel strand 2 passes around one end of each third force transmission plate 53 in the length direction in sequence, so that the steel strand 2 is wavy, and the steel strand 2 abuts against the guide surface 531 of the third force transmission plate 53. Under the guidance of the guide surface 531, the steel strand 2 is closer to the concave arc surface of the middle shell 1, that is, the tensioning force of the steel strand 2 is converted into a force forcing the steel strand 2 to abut against the arc-shaped side of the arched rib 54 through the guide surface 531, which also makes the steel strand 2 arc-shaped.

[0074] In this way, the tensioning force of the steel strand 2 is converted into a force forcing the steel strand 2 to abut against the arc-shaped side of the arched rib 54 through the guide surface 531, that is, a part of the tensioning force of the steel strand 2 is applied vertically to the concave arc surface of the middle shell 1 through the arched rib 54, and another part of the tensioning force of the steel strand 2 is passed through the third force transmission plate 53 to force two adjacent third force transmission plates 53 to separate, and the force of the third force transmission plates 53 separating is applied to the concave arc surface of the middle shell 1, thereby comprehensively improving the compressive resistance of the middle shell 1.

[0075] Furthermore, under the guidance of the guide surface 531, the steel strand 2 is more closely abutted against the arched rib 54, thereby improving the utilization rate of the tensioning force of the steel strand 2, and the guide surfaces 531 of the two adjacent third force transmission plates 53 double-limit the steel strand 2 to improve the position accuracy and stability of the steel strand 2.

[0076] Example 4

[0077] The difference between Example 4 and Example 3 is that Fig.12 , Fig.13 As shown ( Fig.13 The direction of the middle arrow is the direction in which the sawtooth 532 forces the steel strand 2 to deviate when the rubber strip 21 moves relative to the guide surface 531). The prestressed component also includes a rubber strip 21, and the steel strand 2 is spirally wound around the rubber strip 21. The tensioning form can be the following two types. In the first type, the two ends of the steel strand 2 pass through the first anchor seat 31 and the second anchor seat 41 respectively, that is, the hydraulic jack tensions the ends of the steel strand 2. In the second type, the two ends of the steel strand 2 and the rubber strip 21 pass through the first anchor seat 31 and the second anchor seat 41 respectively, that is, the hydraulic jack tensions the ends of the steel strand 2 and the rubber strip 21 at the same time.

[0078] The guide surface 531 is protrudingly structured with a plurality of saw teeth 532 , and the saw teeth 532 engage with the rough surface of the steel strand 2 .

[0079] When the middle shell 1 is subjected to external impact force, part of the impact force will pass through the arched rib 54 and the third force transmission plate 53 to force the steel strand 2 to be stretched. When the steel strand 2 is stretched, it will move relative to the rubber strip 21. The steel strand 2 will further wrap around the rubber strip 21. The rough surface of the steel strand 2 will generate heat by friction with the rubber strip 21 to consume the impact kinetic energy, thereby playing a role in buffering and shock absorption.

[0080] Moreover, in the process of tensioning the steel strand 2, the steel strand 2 moves relative to the guide surface 531 under the guidance of the guide surface 531. Since the serrations 532 engage with the surface of the steel strand 2, the structure of the steel strand 2 engaged by the serrations 532 will be offset around the axial direction of the rubber strip 21, so that the steel strand 2 is further wrapped around the rubber strip 21. The tensioning deformation of the steel strand 2 is greater, the prestress applied is greater, the compressive resistance of the middle shell 1 is further improved, and the twisting degree of the rubber strip 21 is also increased.

[0081] Example 5

[0082] The difference between Example 5 and Example 1 is that Fig.14 , Fig.15 As shown, the middle shell 1 includes two C-shaped plates 12 and two arc-shaped side plates 11 which are separately arranged. The two C-shaped plates 12 are symmetrically arranged with the short axis of the middle shell 1 as the center, and the two arc-shaped side plates 11 are symmetrically arranged with the long axis of the middle shell 1 as the center. The first force transmission plates 51 of each prestressed component are respectively fixed to the concave arc surfaces of the two arc-shaped side plates 11.

[0083] The inner concave arc surface of the C-shaped plate 12 is provided with a plurality of embedding grooves 121 . The embedding grooves 121 penetrate the C-shaped plate 12 along the height direction of the middle shell 1 . The embedding grooves 121 are arranged at intervals along the long axis direction of the middle shell 1 .

[0084] Sealing strips 111 are provided on both sides of the arc-shaped side plate 11 , and the sealing strips 111 extend along the height direction of the middle shell 1 .

[0085] When the middle shell 1 is assembled, the side edges of the arc-shaped side panels 11 are respectively matched with the engaging grooves 121 of the C-shaped panels 12, and then the arc-shaped side panels 11 and the C-shaped panels 12 are respectively matched with the matching grooves 104 of the cover plate 102 and the base 103, and then the steel strands 2 are tensioned, and the tensioning force of the steel strands 2 is applied to the arc-shaped side panels 11 through the first force transmission plates 51, forcing the arc-shaped side panels 11 to move outward, so that the side edges of the arc-shaped side panels 11 are more tightly embedded in the engaging grooves 121, that is, the arc-shaped side panels 11 are pressed onto the C-shaped panels 12. At the same time, the prestress of the steel strands 2 can also force the arc-shaped side panels 11 and the C-shaped panels 12 to further match, and force the cover plate 102 and the base 103 to further clamp the arc-shaped side panels 11 and the C-shaped panels 12, thereby greatly improving the installation and fixing effect of the combined middle shell 1.

[0086] Furthermore, the prestress of the steel strands 2 can also improve the compressive strength of the arc-shaped side panels 11 .

[0087] Secondly, by providing a combined middle shell 1, the sides of the arc-shaped side plates 11 can respectively cooperate with the engaging grooves 121 at different positions to adjust and limit the distance between the two C-shaped plates 12, and at the same time adjust and limit the distance between the two arc-shaped side plates 11, that is, the long axis length and the short axis length of the middle shell 1 can be adjusted, thereby adjusting the volume of the middle shell 1 to be suitable for voltage transformer bodies 10 of different sizes, that is, the middle shell 1 has a wide range of application.

[0088] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A three-phase integrated elliptical voltage transformer for 220kV high-voltage switch, characterized in that: The invention comprises a shell, a plurality of prestressed components and three voltage transformer bodies (10) located in the shell, wherein a shielding member (101) is provided in the shell and is located between two adjacent voltage transformer bodies (10), wherein the shell comprises a cover plate (102), an elliptical middle shell (1) and a base (103); the prestressed components are arranged at intervals along the circumferential direction of the middle shell (1), and the prestressed components comprise a force transmission structure, a steel strand (2), a first anchoring structure (3) and a second anchoring structure (4); the force transmission structure is fixed on the inner concave arc surface of the middle shell (1), the first anchoring structure (3) is used to fix one end of the steel strand (2) on the cover plate (102), and the second anchoring structure (4) is used to fix the other end of the steel strand (2) on the base (103); the steel strand (2) is in a tensioned state. The steel strand (2) is in a tight state, the steel strand (2) is in contact with the force transmission structure, and the tensioning force of the steel strand (2) is applied to the concave arc surface of the middle shell (1) through the force transmission structure; the force transmission structure comprises a plurality of first force transmission pieces (51), the first force transmission pieces (51) are fixed to the concave arc surface of the middle shell (1), the first force transmission pieces (51) extend along the long axis direction of the middle shell (1), the first force transmission pieces (51) are arranged at intervals along the height direction of the middle shell (1), and the width of the first force transmission pieces (51) gradually decreases from the middle part of the height direction of the middle shell (1) to both sides, a bayonet (512) is provided on one side of the first force transmission piece (51), and the steel strand (2) is sequentially clamped in the bayonet (512) of each first force transmission piece (51); a reinforcing rib (511) is fixed between the surface of the first force transmission piece (51) and the concave arc surface of the middle shell (1).

2. The three-phase integrated elliptical voltage transformer for 220kV high-voltage switch according to claim 1 is characterized in that: The width of each of the first force transmission plates (51) gradually decreases toward both sides along the middle portion in the long axis direction of the middle shell (1).

3. The three-phase integrated elliptical voltage transformer for 220kV high-voltage switch according to claim 1 is characterized in that: An elliptical matching groove (104) is provided at the edge of the lower surface of the cover plate (102) and the edge of the upper surface of the base (103); a rubber pad (105) is provided at the bottom of the matching groove (104); and the groove wall of the matching groove (104) is fitted to the outer convex arc surface of the middle shell (1).

4. The three-phase integrated elliptical voltage transformer for 220kV high-voltage switch according to claim 1 is characterized in that: The first force transmission plates (51) of each of the prestressed components are staggered along the long axis direction of the middle shell (1).

5. The three-phase integrated elliptical voltage transformer for 220kV high-voltage switch according to claim 1 is characterized in that: The first anchoring structure (3) comprises a first anchor seat (31) and a first clamp (32); the cover plate (102) is provided with a first countersunk hole (30); the first anchor seat (31) is located in the first countersunk hole (30); a first conical hole (311) is penetrated through the first anchor seat (31); the first clamp (32) is located in the first conical hole (311); three first clamps (32) are arranged evenly spaced around the circumference; the steel strand (2) passes through a central area surrounded by each first clamp (32); the outer surface of each first clamp (32) is in contact with the inner wall of the first conical hole (311); a first friction protrusion (321) is provided on the inner surface of the first clamp (32); the first friction protrusion (321) is engaged with the surface of the steel strand (2); the second anchoring structure ( 4) includes a second anchor seat (41) and a second clip (42), the base (103) is provided with a second countersunk hole (40), the second anchor seat (41) is located in the second countersunk hole (40), the second anchor seat (41) is penetrated by a second conical hole (411), the second clip (42) is located in the second conical hole (411), the number of the second clips (42) is set to three and they are evenly spaced around the circumference, the steel strand (2) passes through the central area surrounded by each second clip (42), the outer surface of each second clip (42) is in contact with the inner wall of the second conical hole (411), the inner surface of the second clip (42) is provided with a second friction protrusion, and the second friction protrusion bites the surface of the steel strand (2); the first countersunk hole (30) and the second countersunk hole (40) are both filled with sealant.

6. A three-phase integrated elliptical voltage transformer for 220kV high-voltage switch, characterized in that: The invention comprises a shell, a plurality of prestressed components and three voltage transformer bodies (10) located in the shell, wherein a shielding member (101) located between two adjacent voltage transformer bodies (10) is provided in the shell, and the shell comprises a cover plate (102), an elliptical middle shell (1) and a base (103); the prestressed components are arranged at intervals along the circumferential direction of the middle shell (1), and the prestressed components comprise a force transmission structure, a steel strand (2), a first anchoring structure (3) and a second anchoring structure (4); the force transmission structure is fixed on the inner concave arc surface of the middle shell (1), the first anchoring structure (3) is used to fix one end of the steel strand (2) on the cover plate (102), and the second anchoring structure (4) is used to fix the steel strand (2) on the inner concave arc surface of the middle shell (1). ) is fixed on the base (103), the steel strand (2) is in a taut state, the steel strand (2) is in contact with the force transmission structure, and the tensioning force of the steel strand (2) is applied to the concave arc surface of the middle shell (1) through the force transmission structure; the force transmission structure comprises a plurality of second force transmission pieces (52), the second force transmission pieces (52) are fixed to the concave arc surface of the middle shell (1), the second force transmission pieces (52) extend along the long axis direction of the middle shell (1), the second force transmission pieces (52) are arranged at intervals along the height direction of the middle shell (1), and the second force transmission pieces (52) are staggered along the height direction of the middle shell (1), the steel strand (2) successively passes around one end of each second force transmission piece (52) in the length direction, and the steel strand (2) is in a wavy state.

7. A three-phase integrated elliptical voltage transformer for 220kV high-voltage switch, characterized in that: The invention comprises a shell, a plurality of prestressed components and three voltage transformer bodies (10) located in the shell, wherein a shielding member (101) located between two adjacent voltage transformer bodies (10) is provided in the shell, and the shell comprises a cover plate (102), an elliptical middle shell (1) and a base (103); the prestressed components are arranged at intervals along the circumferential direction of the middle shell (1), and the prestressed components comprise a force transmission structure, a steel strand (2), a first anchoring structure (3) and a second anchoring structure (4), and the force transmission structure is fixed to On the concave arc surface of the middle shell (1), the first anchoring structure (3) is used to fix one end of the steel strand (2) to the cover plate (102), and the second anchoring structure (4) is used to fix the other end of the steel strand (2) to the base (103); the steel strand (2) is in a taut state, and the steel strand (2) abuts against the force transmission structure, and the tensioning force of the steel strand (2) is applied to the concave arc surface of the middle shell (1) through the force transmission structure; the force transmission structure includes an arched rib plate (5 4) and a plurality of third force transmission pieces (53), the arched ribs (54) and the third force transmission pieces (53) are both fixed to the inner concave arc surface of the middle shell (1), the third force transmission pieces (53) extend along the long axis direction of the middle shell (1), the third force transmission pieces (53) are arranged at intervals along the height direction of the middle shell (1), and the third force transmission pieces (53) are staggered along the height direction of the middle shell (1), and one end of the third force transmission piece (53) in the length direction has a guide surface (531); the arched ribs (54) extend along the height direction of the middle shell (1) The steel strand (2) extends in the longitudinal direction, the width of the arched rib (54) gradually decreases from the middle to the two ends, and the arched rib (54) passes through each third force transmission plate (53); the steel strand (2) successively passes around one end of each third force transmission plate (53) in the length direction, and the steel strand (2) abuts against the guide surface (531) of the third force transmission plate (53), and the tensioning force of the steel strand (2) is converted into a force forcing the steel strand (2) to abut against the arc-shaped side edge of the arched rib (54) through the guide surface (531), and the steel strand (2) is in a wavy shape.

8. The three-phase integrated elliptical voltage transformer for 220kV high-voltage switch according to claim 7, characterized in that: The prestressed component also includes a rubber strip (21), the steel strand (2) is spirally wound around the rubber strip (21), and the guide surface (531) is protrudingly structured with a plurality of saw teeth (532), and the saw teeth (532) are engaged with the surface of the steel strand (2).

9. The three-phase integrated elliptical voltage transformer for 220kV high-voltage switch according to any one of claims 1-3 and 6-8, characterized in that: The middle shell (1) comprises two C-shaped plates (12) and two arc-shaped side plates (11) which are separately arranged. The two C-shaped plates (12) are symmetrically arranged with the short axis of the middle shell (1) as the center, and the two arc-shaped side plates (11) are symmetrically arranged with the long axis of the middle shell (1) as the center. The inner concave arc surface of the C-shaped plate (12) is provided with a plurality of engaging grooves (121). The engaging grooves (121) penetrate the C-shaped plate (12) along the height direction of the middle shell (1). ), each engaging groove (121) is arranged at intervals along the long axis direction of the middle shell (1); sealing strips (111) are provided on both sides of the arc-shaped side plate (11); the force transmission structure is fixed on the inner concave arc surface of the arc-shaped side plate (11), and the tensioning force of the steel strand (2) is applied to the arc-shaped side plate (11) through the force transmission structure to force the sealing strip (111) of the arc-shaped side plate (11) to abut against one of the engaging grooves (121).

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